The learning process during the covid-19 epidemic was not efficient, resulting in low higher-order thinking skills in elementary school students, which prompted this study. The purpose of this study was to improve the higher-order thinking skills of elementary school students using the social reconstruction model for learning during the COVID-19 pandemic. This study was a type of classroom action research, which includes planning, implementing, observing, and reflecting stages. This study took place in a public school in Bukittinggi involving 35 students in grade 5 elementary school. This study found that in the first cycle, the higherorder thinking skill of elementary school students got an average score of 65.45, and in the second cycle, the average score was 81.25. This result showed that during the COVID-19 epidemic, elementary students who used the social reconstruction model for learning improved their higher-order thinking skills. The findings of this study can be utilized as a guide to help elementary school students improve their high-order thinking skills during the COVID-19 epidemic.

This study was prompted by the development of Android-based scientific learning media for elementary school students, with the goal of improving critical thinking abilities in pupils who wanted to know the level of efficacy during the covid-19 epidemic. The purpose of this study was to examine how androidbased scientific learning media improved the critical thinking skills of primary school children. This study used a quasi-experimental design. The sample technique used was simple random sampling. The data was analyzed using the T-test. Ho was rejected since the hypothesis test indicated that t count > t table. It was discovered that primary school pupils who learned utilizing android-based learning material have varying levels of critical thinking ability. As a result, android-based scientific learning material has an influence. on elementary school students' critical thinking skills. The findings of this study can be used by teachers to help students improve their critical thinking skills in elementary school.